Microscopic calculation of the form factors for deeply inelastic heavy-ion collisions within the statistical model

Bruce R Barrett, S. Shlomo, H. A. Weidenmüller

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Agassi, Ko, and Weidenmüller have recently developed a transport theory of deeply inelastic heavy-ion collisions based on a random-matrix model. In this work it was assumed that the reduced form factors, which couple the relative motion with the intrinsic excitation of either fragment, represent a Gaussian stochastic process with zero mean and a second moment characterized by a few parameters. In the present paper, we give a justification of the statistical assumptions of Agassi, Ko, and Weidenmüller and of the form of the second moment assumed in their work, and calculate the input parameters of their model for two cases: Ar40 on Pb208 and Ar40 on Sn120. We find values for the strength, correlation length, and angular momentum dependence of the second moment, which are consistent with those estimated by Agassi, Ko, and Weidenmüller. We consider only inelastic excitations (no nucleon transfer) caused by the penetration of the single-particle potential well of the light ion into the mass distribution of the heavy one. This is combined with a random-matrix model for the high-lying excited states of the heavy ion. As a result we find formulas which relate simply to those of Agassi, Ko, and Weidenmüller, and which can be evaluated numerically, yielding the results mentioned above. Our results also indicate for which distances of closest approach the Agassi-Ko-Weidenmüller theory breaks down. [NUCLEAR REACTIONS Random-matrix model and shell model used to calculate distribution of form factors.]

Original languageEnglish (US)
Pages (from-to)544-554
Number of pages11
JournalPhysical Review C - Nuclear Physics
Volume17
Issue number2
DOIs
StatePublished - 1978

Fingerprint

inelastic collisions
ionic collisions
form factors
moments
excitation
transport theory
light ions
stochastic processes
mass distribution
heavy ions
penetration
angular momentum
breakdown
fragments

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Microscopic calculation of the form factors for deeply inelastic heavy-ion collisions within the statistical model. / Barrett, Bruce R; Shlomo, S.; Weidenmüller, H. A.

In: Physical Review C - Nuclear Physics, Vol. 17, No. 2, 1978, p. 544-554.

Research output: Contribution to journalArticle

@article{4c5337c0a8bb4cd78a58f7ee6fbee7a2,
title = "Microscopic calculation of the form factors for deeply inelastic heavy-ion collisions within the statistical model",
abstract = "Agassi, Ko, and Weidenm{\"u}ller have recently developed a transport theory of deeply inelastic heavy-ion collisions based on a random-matrix model. In this work it was assumed that the reduced form factors, which couple the relative motion with the intrinsic excitation of either fragment, represent a Gaussian stochastic process with zero mean and a second moment characterized by a few parameters. In the present paper, we give a justification of the statistical assumptions of Agassi, Ko, and Weidenm{\"u}ller and of the form of the second moment assumed in their work, and calculate the input parameters of their model for two cases: Ar40 on Pb208 and Ar40 on Sn120. We find values for the strength, correlation length, and angular momentum dependence of the second moment, which are consistent with those estimated by Agassi, Ko, and Weidenm{\"u}ller. We consider only inelastic excitations (no nucleon transfer) caused by the penetration of the single-particle potential well of the light ion into the mass distribution of the heavy one. This is combined with a random-matrix model for the high-lying excited states of the heavy ion. As a result we find formulas which relate simply to those of Agassi, Ko, and Weidenm{\"u}ller, and which can be evaluated numerically, yielding the results mentioned above. Our results also indicate for which distances of closest approach the Agassi-Ko-Weidenm{\"u}ller theory breaks down. [NUCLEAR REACTIONS Random-matrix model and shell model used to calculate distribution of form factors.]",
author = "Barrett, {Bruce R} and S. Shlomo and Weidenm{\"u}ller, {H. A.}",
year = "1978",
doi = "10.1103/PhysRevC.17.544",
language = "English (US)",
volume = "17",
pages = "544--554",
journal = "Physical Review C - Nuclear Physics",
issn = "0556-2813",
publisher = "American Physical Society",
number = "2",

}

TY - JOUR

T1 - Microscopic calculation of the form factors for deeply inelastic heavy-ion collisions within the statistical model

AU - Barrett, Bruce R

AU - Shlomo, S.

AU - Weidenmüller, H. A.

PY - 1978

Y1 - 1978

N2 - Agassi, Ko, and Weidenmüller have recently developed a transport theory of deeply inelastic heavy-ion collisions based on a random-matrix model. In this work it was assumed that the reduced form factors, which couple the relative motion with the intrinsic excitation of either fragment, represent a Gaussian stochastic process with zero mean and a second moment characterized by a few parameters. In the present paper, we give a justification of the statistical assumptions of Agassi, Ko, and Weidenmüller and of the form of the second moment assumed in their work, and calculate the input parameters of their model for two cases: Ar40 on Pb208 and Ar40 on Sn120. We find values for the strength, correlation length, and angular momentum dependence of the second moment, which are consistent with those estimated by Agassi, Ko, and Weidenmüller. We consider only inelastic excitations (no nucleon transfer) caused by the penetration of the single-particle potential well of the light ion into the mass distribution of the heavy one. This is combined with a random-matrix model for the high-lying excited states of the heavy ion. As a result we find formulas which relate simply to those of Agassi, Ko, and Weidenmüller, and which can be evaluated numerically, yielding the results mentioned above. Our results also indicate for which distances of closest approach the Agassi-Ko-Weidenmüller theory breaks down. [NUCLEAR REACTIONS Random-matrix model and shell model used to calculate distribution of form factors.]

AB - Agassi, Ko, and Weidenmüller have recently developed a transport theory of deeply inelastic heavy-ion collisions based on a random-matrix model. In this work it was assumed that the reduced form factors, which couple the relative motion with the intrinsic excitation of either fragment, represent a Gaussian stochastic process with zero mean and a second moment characterized by a few parameters. In the present paper, we give a justification of the statistical assumptions of Agassi, Ko, and Weidenmüller and of the form of the second moment assumed in their work, and calculate the input parameters of their model for two cases: Ar40 on Pb208 and Ar40 on Sn120. We find values for the strength, correlation length, and angular momentum dependence of the second moment, which are consistent with those estimated by Agassi, Ko, and Weidenmüller. We consider only inelastic excitations (no nucleon transfer) caused by the penetration of the single-particle potential well of the light ion into the mass distribution of the heavy one. This is combined with a random-matrix model for the high-lying excited states of the heavy ion. As a result we find formulas which relate simply to those of Agassi, Ko, and Weidenmüller, and which can be evaluated numerically, yielding the results mentioned above. Our results also indicate for which distances of closest approach the Agassi-Ko-Weidenmüller theory breaks down. [NUCLEAR REACTIONS Random-matrix model and shell model used to calculate distribution of form factors.]

UR - http://www.scopus.com/inward/record.url?scp=26144463445&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=26144463445&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.17.544

DO - 10.1103/PhysRevC.17.544

M3 - Article

VL - 17

SP - 544

EP - 554

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 2

ER -